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"Unique" 7-inch slide rule

Unique Electrical Slide Rule

1935-1950
Friel-Sturdy radiographic slide rule with case by the Unique Slide Rule Company, used to determine exposure times for medical X-rays.

Friel-Sturdy radiographic slide rule with case, to determine exposure times for medical X-rays

circa 1946
Unique Log-Log (5-inch) slide rule with cardboard case

Unique Log-Log (5-inch) slide rule

1945-1955
`Unique' 10-inch slide rule in cardboard case, with tables containing properties of materials on the back, c. 1940, made in England

`Unique' 10-inch slide rule in cardboard case

1940